/* ============================================================
   球速看台 · 共享外壳样式 /assets/site.css
   夜看台墨绿底 + 荧光青刻度 + 跑道红入口 + 琥珀脉冲
   ============================================================ */

:root{
  --ink:#0B1F1A;
  --panel:#12302A;
  --line:#24463E;
  --cyan:#2FE6C8;
  --cyan-soft:#9BF7E4;
  --red:#E23E3E;
  --amber:#F2A93B;
  --white:#F4F7F5;
  --muted:#7E9A92;
  --indigo:#101C2B;
  --wine:#4A1620;
  --edge:2px;
  --header-h:64px;
  --rail-w:184px;
  --maxw:1180px;
  --shadow:8px 8px 0 rgba(0,0,0,.45);
  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-body:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--ink);
  color:var(--white);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
}
img,svg,video{max-width:100%;display:block}
a{color:var(--cyan);text-decoration:none}
a:hover{color:var(--cyan-soft)}
button{font:inherit;color:inherit}
ul,ol{margin:0 0 1em;padding-left:1.2em}
p{margin:0 0 1em}
h1,h2,h3,h4,h5,h6{
  margin:0 0 .5em;
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.16;
  letter-spacing:-.015em;
}
h1{font-size:40px}
h2{font-size:28px}
h3{font-size:20px}
h4{font-size:17px}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
::selection{background:var(--cyan);color:var(--ink)}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;
  top:-120px;
  left:12px;
  z-index:140;
  padding:10px 16px;
  background:var(--cyan);
  color:var(--ink);
  font-weight:800;
  font-size:14px;
  border:var(--edge) solid var(--ink);
  transition:top .16s ease;
}
.skip-link:focus{top:12px;color:var(--ink)}

/* ---------- 头部 ---------- */
.site-header{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:90;
  background:transparent;
  transition:background .24s ease,box-shadow .24s ease;
}
.site-header[data-scrolled="true"]{
  background:rgba(11,31,26,.96);
  box-shadow:0 2px 0 0 var(--line);
}
.header-inner{
  display:flex;
  align-items:center;
  gap:10px;
  height:var(--header-h);
  padding:0 14px;
}
.header-inner > .brand{margin-right:auto}

.brand{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  color:var(--white);
  text-decoration:none;
}
.brand:hover{color:var(--white)}
.brand-mark{
  display:grid;
  place-items:center;
  width:38px;
  height:38px;
  flex:0 0 auto;
  border:var(--edge) solid var(--cyan);
  background:var(--panel);
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:700;
  letter-spacing:.06em;
  box-shadow:3px 3px 0 rgba(0,0,0,.5);
}
.brand-text{display:block}
.brand-name{
  display:block;
  font-family:var(--font-display);
  font-weight:900;
  font-size:17px;
  letter-spacing:.04em;
  line-height:1.1;
}
.brand-tagline{
  display:none;
  font-size:11px;
  letter-spacing:.16em;
  color:var(--muted);
  line-height:1.4;
}

.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:44px;
  padding:8px 12px;
  background:rgba(18,48,42,.72);
  border:var(--edge) solid var(--line);
  color:var(--white);
  font-family:var(--font-display);
  font-weight:800;
  font-size:13px;
  letter-spacing:.08em;
  cursor:pointer;
}
.nav-toggle:hover{border-color:var(--cyan-soft)}
.nav-toggle[aria-expanded="true"]{border-color:var(--amber);color:var(--amber)}
.nav-toggle-bars{display:inline-flex;flex-direction:column;gap:4px;width:18px}
.nav-toggle-bar{display:block;height:2px;width:100%;background:var(--cyan)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar{background:var(--amber)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){opacity:.35}

.header-cta{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:8px 12px;
  background:var(--red);
  color:var(--white);
  border:var(--edge) solid #F06A6A;
  font-family:var(--font-display);
  font-weight:900;
  font-size:13px;
  letter-spacing:.02em;
  white-space:nowrap;
  box-shadow:4px 4px 0 rgba(0,0,0,.45);
  transition:transform .14s ease,background .14s ease;
}
.header-cta:hover{background:#F04C4C;color:var(--white);transform:translate(-1px,-1px)}

/* 导航：移动端为下拉面板 */
.site-nav{
  position:fixed;
  top:var(--header-h);
  left:0;
  right:0;
  z-index:88;
  background:var(--panel);
  border-bottom:var(--edge) solid var(--line);
  max-height:0;
  overflow:hidden;
  visibility:hidden;
  transition:max-height .28s ease,visibility .28s ease;
}
.site-nav[data-open="true"]{
  max-height:82vh;
  overflow-y:auto;
  visibility:visible;
}
.nav-list{
  list-style:none;
  margin:0;
  padding:8px 16px 6px;
  display:flex;
  flex-direction:column;
}
.nav-item{margin:0}
.nav-link{
  display:flex;
  align-items:center;
  justify-content:space-between;
  min-height:48px;
  padding:8px 2px;
  color:var(--white);
  font-family:var(--font-display);
  font-weight:800;
  font-size:16px;
  letter-spacing:.02em;
  border-bottom:1px solid var(--line);
}
.nav-link::after{content:"›";color:var(--muted);font-family:var(--font-mono)}
.nav-link:hover{color:var(--cyan)}
.nav-link[aria-current="page"]{color:var(--cyan)}
.nav-link[aria-current="page"]::after{content:"●";color:var(--cyan)}
.nav-note{
  margin:0;
  padding:10px 16px 16px;
  font-size:12px;
  line-height:1.7;
  letter-spacing:.06em;
  color:var(--muted);
}

/* 阅读进度 */
.scroll-meter{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:3px;
  background:rgba(244,247,245,.08);
  overflow:hidden;
}
.scroll-meter-bar{
  display:block;
  width:calc(var(--progress,0) * 100%);
  height:100%;
  background:linear-gradient(90deg,var(--cyan),var(--amber));
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  background:var(--panel);
  border-top:var(--edge) solid var(--line);
  padding:46px 0 26px;
}
.site-footer::before{
  content:"";
  position:absolute;
  top:2px;
  left:0;
  right:0;
  height:10px;
  background-image:repeating-linear-gradient(90deg,var(--cyan) 0 2px,transparent 2px 34px);
  opacity:.4;
  pointer-events:none;
}
.footer-marker{
  margin:0 0 26px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.2em;
  color:var(--amber);
}
.footer-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:28px;
}
.footer-brand{min-width:0}
.footer-logo{
  margin:0 0 8px;
  font-family:var(--font-display);
  font-weight:900;
  font-size:24px;
  letter-spacing:.04em;
}
.footer-tagline{
  margin:0 0 18px;
  max-width:32em;
  font-size:14px;
  line-height:1.7;
  color:var(--muted);
}
.footer-meta{list-style:none;margin:0;padding:0}
.footer-meta-item{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  padding:7px 0;
  border-bottom:1px dotted var(--line);
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.6;
  word-break:break-all;
}
.footer-meta-label{
  flex:0 0 auto;
  color:var(--muted);
  letter-spacing:.1em;
}
.footer-col{min-width:0}
.footer-col-title{
  margin:0 0 12px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.18em;
  color:var(--cyan);
}
.footer-links{list-style:none;margin:0;padding:0}
.footer-link{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  font-size:15px;
  color:var(--white);
  border-bottom:var(--edge) solid transparent;
}
.footer-link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.footer-base{
  margin-top:36px;
  padding-top:18px;
  border-top:var(--edge) solid var(--line);
  display:flex;
  flex-wrap:wrap;
  gap:10px 26px;
  align-items:baseline;
  justify-content:space-between;
}
.footer-note{
  flex:1 1 320px;
  margin:0;
  font-size:12px;
  line-height:1.8;
  color:var(--muted);
}
.footer-legal{
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--muted);
}

/* ---------- 通用布局 ---------- */
.wrap{
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 18px;
}
.grid-12{display:grid;grid-template-columns:1fr;gap:20px}
.section{padding:52px 0;position:relative}
.section--indigo{background:var(--indigo)}
.section--wine{background:var(--wine)}
.prose{max-width:34em}
.prose p{font-size:17px;line-height:1.78}

/* ---------- 通用元件 ---------- */
.eyebrow{
  display:inline-block;
  margin:0 0 12px;
  padding:4px 10px;
  border:var(--edge) solid var(--line);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.18em;
  color:var(--amber);
}
.ticks{
  height:24px;
  margin:0;
  border:0;
  border-top:var(--edge) solid var(--line);
  background-image:repeating-linear-gradient(90deg,var(--line) 0 2px,transparent 2px 28px);
  background-size:28px 10px;
  background-repeat:repeat-x;
  background-position:left top;
}
.note-rotated{
  writing-mode:vertical-rl;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--muted);
}
.tnum{
  font-family:var(--font-mono);
  font-weight:700;
  letter-spacing:-.01em;
  font-variant-numeric:tabular-nums;
}
.panel{
  background:var(--panel);
  border:var(--edge) solid var(--line);
  box-shadow:var(--shadow);
  padding:22px;
}
.panel--indigo{background:var(--indigo);border-color:#22384F}
.panel--wine{background:var(--wine);border-color:#7A2A37}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  padding:10px 18px;
  background:var(--panel);
  color:var(--white);
  border:var(--edge) solid var(--line);
  font-family:var(--font-display);
  font-weight:800;
  font-size:15px;
  letter-spacing:.02em;
  text-decoration:none;
  box-shadow:6px 6px 0 rgba(0,0,0,.45);
  transition:transform .14s ease,box-shadow .14s ease,background .14s ease,border-color .14s ease,color .14s ease;
}
.btn:hover{
  color:var(--white);
  border-color:var(--cyan-soft);
  transform:translate(-2px,-2px);
  box-shadow:8px 8px 0 rgba(0,0,0,.5);
}
.btn--primary{background:var(--cyan);color:var(--ink);border-color:var(--cyan-soft)}
.btn--primary:hover{background:var(--cyan-soft);color:var(--ink)}
.btn--signal{background:var(--red);color:var(--white);border-color:#F06A6A}
.btn--signal:hover{background:#F04C4C;color:var(--white)}
.btn--ghost{background:transparent}
.btn--ghost:hover{background:rgba(47,230,200,.1)}

/* 面包屑 */
.breadcrumb{
  padding:12px 0;
  border-bottom:var(--edge) solid var(--line);
}
.breadcrumb-list{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin:0;
  padding:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--muted);
}
.breadcrumb-item + .breadcrumb-item::before{
  content:"/";
  margin-right:8px;
  color:var(--line);
}
.breadcrumb-link{color:var(--cyan)}
.breadcrumb-current{color:var(--muted)}

/* 阶梯卡片 */
.step-card{
  position:relative;
  display:block;
  min-height:44px;
  padding:18px;
  background:var(--panel);
  border:var(--edge) solid var(--line);
  color:var(--white);
  text-decoration:none;
  box-shadow:6px 6px 0 rgba(0,0,0,.4);
  transition:transform .14s ease,border-color .14s ease,box-shadow .14s ease;
}
.step-card:hover{
  color:var(--white);
  border-color:var(--cyan);
  transform:translate(-2px,-2px);
  box-shadow:8px 8px 0 rgba(0,0,0,.5);
}
.step-card-num{
  display:block;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--amber);
}
.step-card-title{
  display:block;
  margin:8px 0 4px;
  font-family:var(--font-display);
  font-weight:900;
  font-size:20px;
  letter-spacing:-.01em;
}
.step-card-desc{
  margin:0;
  font-size:14px;
  line-height:1.7;
  color:var(--muted);
}

/* 图片容器（页面阶段放图） */
.media{
  position:relative;
  border:var(--edge) solid var(--line);
  background:var(--panel);
  box-shadow:var(--shadow);
  overflow:hidden;
}
.media-img{
  width:100%;
  height:auto;
  aspect-ratio:16/10;
  object-fit:cover;
  color:transparent;
  background:
    repeating-linear-gradient(115deg,rgba(47,230,200,.14) 0 2px,transparent 2px 14px),
    linear-gradient(140deg,#0B1F1A 0%,#12302A 55%,#24463E 100%);
}
.media--wide .media-img{aspect-ratio:21/9}
.media--tall .media-img{aspect-ratio:4/5}
.media-cap{
  display:block;
  padding:10px 14px;
  border-top:var(--edge) solid var(--line);
  background:rgba(0,0,0,.28);
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.6;
  color:var(--muted);
}

/* 折叠面板 */
.fold{
  background:var(--panel);
  border:var(--edge) solid var(--line);
  box-shadow:var(--shadow);
  margin:0 0 16px;
}
.fold-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  width:100%;
  min-height:48px;
  padding:14px 18px;
  background:transparent;
  border:0;
  color:var(--white);
  font-family:var(--font-display);
  font-weight:800;
  font-size:17px;
  letter-spacing:.01em;
  text-align:left;
  cursor:pointer;
}
.fold-head:hover{color:var(--cyan)}
.fold-sign{
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-size:18px;
  line-height:1;
  color:var(--cyan);
}
.fold-body{
  max-height:0;
  overflow:hidden;
  padding:0 18px;
  transition:max-height .22s ease;
}
.fold[data-open="true"] .fold-head{border-bottom:var(--edge) solid var(--line)}
.fold[data-open="true"] .fold-sign{color:var(--amber)}

/* 标签页 */
.tabs{margin:0 0 20px}
.tabs-list{
  display:flex;
  flex-wrap:wrap;
  border-bottom:var(--edge) solid var(--line);
}
.tabs-tab{
  min-height:44px;
  padding:10px 16px;
  background:transparent;
  border:var(--edge) solid transparent;
  border-bottom:0;
  color:var(--muted);
  font-family:var(--font-display);
  font-weight:800;
  font-size:15px;
  letter-spacing:.02em;
  cursor:pointer;
}
.tabs-tab:hover{color:var(--cyan)}
.tabs-tab[aria-selected="true"]{
  background:var(--cyan);
  border-color:var(--cyan);
  color:var(--ink);
}
.tabs-panel{padding:20px 0}
.tabs-panel[hidden]{display:none}

/* 比分脉冲 */
.pulse{animation:pulseAmber 1.2s ease-in-out 1}
@keyframes pulseAmber{
  0%{box-shadow:0 0 0 0 rgba(242,169,59,.75);border-color:var(--amber)}
  100%{box-shadow:0 0 0 14px rgba(242,169,59,0);border-color:var(--line)}
}

/* ---------- 平板 ---------- */
@media (min-width:640px){
  .wrap{padding:0 24px}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (min-width:768px){
  .grid-12{grid-template-columns:repeat(12,1fr)}
  .col-3{grid-column:span 3}
  .col-4{grid-column:span 4}
  .col-5{grid-column:span 5}
  .col-6{grid-column:span 6}
  .col-7{grid-column:span 7}
  .col-8{grid-column:span 8}
  .col-12{grid-column:span 12}
}

/* ---------- 桌面：左侧垂直时间轴 ---------- */
@media (min-width:1080px){
  body{padding-left:var(--rail-w)}
  .wrap{padding:0 32px}

  .site-header{
    top:0;
    bottom:0;
    right:auto;
    width:var(--rail-w);
    background:transparent;
    box-shadow:none;
  }
  .site-header[data-scrolled="true"]{
    background:var(--ink);
    box-shadow:2px 0 0 0 var(--line),6px 0 22px rgba(0,0,0,.45);
  }
  .header-inner{
    flex-direction:column;
    align-items:stretch;
    height:100%;
    padding:24px 16px 20px;
    gap:0;
    overflow-y:auto;
  }
  .header-inner > .brand{margin-right:0}
  .brand{flex-direction:column;align-items:flex-start;gap:12px}
  .brand-tagline{display:block}
  .nav-toggle{display:none}

  .site-nav{
    position:static;
    max-height:none;
    overflow:visible;
    visibility:visible;
    background:transparent;
    border-bottom:0;
    border-top:var(--edge) solid var(--line);
    margin-top:26px;
    padding-top:14px;
  }
  .site-nav[data-open="true"]{max-height:none}
  .nav-list{padding:0;flex-direction:column}
  .nav-link{
    position:relative;
    display:block;
    min-height:0;
    padding:11px 0 11px 18px;
    font-size:14px;
    letter-spacing:.06em;
    border-bottom:1px solid rgba(36,70,62,.65);
  }
  .nav-link::after{content:none}
  .nav-link::before{
    content:"";
    position:absolute;
    left:0;
    top:50%;
    width:6px;
    height:2px;
    background:var(--line);
    transform:translateY(-50%);
    transition:width .14s ease,background .14s ease;
  }
  .nav-link:hover::before{width:12px;background:var(--cyan-soft)}
  .nav-link[aria-current="page"]{color:var(--cyan)}
  .nav-link[aria-current="page"]::before{width:16px;background:var(--cyan)}
  .nav-note{padding:12px 0 0;font-size:11px;line-height:1.7}

  .header-cta{margin-top:auto;width:100%;font-size:14px;padding:10px 12px}

  .scroll-meter{
    left:auto;
    right:-2px;
    top:0;
    bottom:0;
    width:3px;
    height:auto;
  }
  .scroll-meter-bar{
    width:100%;
    height:calc(var(--progress,0) * 100%);
    background:linear-gradient(180deg,var(--amber),var(--cyan));
  }

  .footer-grid{grid-template-columns:1.6fr 1fr 1fr 1fr;gap:36px}
  .section{padding:64px 0}
}

/* ---------- 手机 ---------- */
@media (max-width:640px){
  h1{font-size:30px}
  h2{font-size:24px}
  h3{font-size:18px}
  .prose p{font-size:16px}
  .panel{padding:16px}
  .section{padding:40px 0}
  .header-cta{padding:8px 10px;font-size:12px}
  .footer-grid{gap:22px}
}

/* ---------- 可访问性 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .pulse{animation:none;border-color:var(--amber)}
}